1. A particularly large crap.
2. The release of diaria often before a sporting activity of some importance.
3. The gathering of teamates to release excess waste before a sporting activity.
This term originated when the Cardinal Gibbons varsity lacrosse team joined in the act of crapping before a game vs Durham Academy. The legacy and tradition of the pregame still lives on to this day.

John: "Yo Kev!"
Kev: "What you want?"
John: "You ready for the big game?"
Kev: "Yeah, im stretched and ready to go- theres only one thing left to be done."
"PREGAME!"
"PREGAME!" they chanted together
"PREGAME!"
"PREGAME!"
"PREGAME!"
"PREGAME!"
"PREGAME!"
"PREGAME!"
"PREGAME!"
"PREGAME!"
"PREGAME!"
"PREGAME!!!!!!! AAAAAHHHHH"
and they proceeded to release their waste in the ceremonious bonding ritual of the pregame.